Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Loss reserves	$ 161	$ 205
Employee benefits	83	86
Accrued expenses	16	7
Depreciation and amortization	13	0
Lease liability	94	100
Federal loss carryforwards	38	44
State loss carryforwards	2	9
Investment in debt securities assets (ASC 320)	12	0
Other	29	20
Gross deferred tax assets	448	471
Deferred tax liabilities:
Depreciation and amortization	0	83
Investment in debt securities liabilities (ASC 320)	0	35
Equity investments	4	11
Other intangible assets	86	93
Prepaid expenses	18	15
ROU lease asset	85	89
Leasing	198	135
Other	5	10
Gross deferred tax liabilities	396	471
Net deferred tax assets	$ 52	$ 0